As the Special Rapporteur had noted, in the Barcelona Traction case investment treaties had been treated as lex specialis and if they had not become part of customary international law they should continue to be treated as such.
Como ha señalado el Relator Especial, en el asunto de la Barcelona Traction los tratados sobre inversiones fueron considerados lex specialis, y, al no formar parte del derecho internacional consuetudinario, deben seguir considerándose así.